A troy ounce is exactly 31.1034768 grams.
Troy ounces to Femtograms Converter — oz t to fg
Convert Troy ounce (oz t) to Femtogram (fg) using the exact conversion factor (1 troy ounce = 3.110348e+16 femtogram). See the formula, worked examples, and conversion table.
Troy ounces to Femtograms converter
Converter
Mass/Weight Converter
Convert SI mass, imperial weight, jewelry, atomic, and astronomy mass units.
Context values
Some unit families need one extra value for a physically accurate result.
Femtogram is 1e-15 gram units.
Result = input x 0.0311034768 / 1e-18.
Mass uses the kilogram as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Troy ounces to Femtograms
Weight conversions between Troy ounce and Femtogram come up constantly in everyday commerce, shipping, and cooking, since US packaging is usually labeled in pounds while most of the rest of the world uses kilograms. Specifically: A troy ounce is exactly 31.1034768 grams, and femtogram is 1e-15 gram units.
Formula
femtograms = troy ounces × 3.110348e+16
This factor comes from each unit's defined relationship to the category's base unit: 1 troy ounce equals 0.0311034768 base units, and 1 femtogram equals 1e-18 base units, so dividing one by the other gives the direct troy ounce-to-femtogram factor of 3.110348e+16.
Simple example
1 oz t × 3.110348e+16 = 3.110348e+16 fg
1 troy ounce = 3.110348e+16 femtograms.
Real-world example
50 oz t × 3.110348e+16 = 1.555174e+18 fg
50 troy ounces = 1.555174e+18 femtograms.
Conversion table
| Troy ounce (oz t) | Femtogram (fg) |
|---|---|
| 1 oz t | 3.110348e+16 fg |
| 5 oz t | 1.555174e+17 fg |
| 10 oz t | 3.110348e+17 fg |
| 25 oz t | 7.775869e+17 fg |
| 50 oz t | 1.555174e+18 fg |
| 100 oz t | 3.110348e+18 fg |
Reverse conversion: Femtogram to Troy ounce
3.110348e+16 fg × 3.215075e-17 = 1.000000103 oz t
3.110348e+16 femtograms = 1.000000103 troy ounces.
troy ounces = femtograms × 3.215075e-17
For a page dedicated to this direction, see Femtogram to Troy ounce.
Understanding the Troy ounce (oz t)
A troy ounce is exactly 31.1034768 grams.
Understanding the Femtogram (fg)
Femtogram is 1e-15 gram units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many femtograms are in 1 troy ounce?
1 troy ounce equals 3.110348e+16 femtograms, using the exact defined conversion factor rather than an estimate.
How do I convert troy ounce to femtogram?
Multiply the troy ounce value by 3.110348e+16. The converter above does this instantly to whatever precision you set.
How do I convert femtogram back to troy ounce?
Use the reverse factor: 1 femtogram equals 3.215075e-17 troy ounces. You can also use the swap control in the converter above to flip the direction instantly.
What is a troy ounce?
Troy ounce (oz t) is a unit of mass/weight.
What is a femtogram?
Femtogram (fg) is a unit of mass/weight.
Is the troy ounce to femtogram conversion exact?
Yes. Both troy ounce and femtogram are defined by fixed standards rather than physical artifacts, so the factor of 3.110348e+16 used above is exact to as many digits as you choose to display.